1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2022 Richtek Technology Corp.
4 * Author: ChiYuan Huang <cy_huang@richtek.com>
5 */
6
7#include <linux/bits.h>
8#include <linux/input.h>
9#include <linux/interrupt.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/mod_devicetable.h>
13#include <linux/platform_device.h>
14#include <linux/regmap.h>
15
16#define RT5120_REG_INTSTAT 0x1E
17#define RT5120_PWRKEYSTAT_MASK BIT(7)
18
19struct rt5120_priv {
20 struct regmap *regmap;
21 struct input_dev *input;
22};
23
24static irqreturn_t rt5120_pwrkey_handler(int irq, void *devid)
25{
26 struct rt5120_priv *priv = devid;
27 unsigned int stat;
28 int error;
29
30 error = regmap_read(map: priv->regmap, RT5120_REG_INTSTAT, val: &stat);
31 if (error)
32 return IRQ_NONE;
33
34 input_report_key(dev: priv->input, KEY_POWER,
35 value: !(stat & RT5120_PWRKEYSTAT_MASK));
36 input_sync(dev: priv->input);
37
38 return IRQ_HANDLED;
39}
40
41static int rt5120_pwrkey_probe(struct platform_device *pdev)
42{
43 struct rt5120_priv *priv;
44 struct device *dev = &pdev->dev;
45 int press_irq, release_irq;
46 int error;
47
48 priv = devm_kzalloc(dev, size: sizeof(*priv), GFP_KERNEL);
49 if (!priv)
50 return -ENOMEM;
51
52 priv->regmap = dev_get_regmap(dev: dev->parent, NULL);
53 if (!priv->regmap) {
54 dev_err(dev, "Failed to init regmap\n");
55 return -ENODEV;
56 }
57
58 press_irq = platform_get_irq_byname(pdev, "pwrkey-press");
59 if (press_irq < 0)
60 return press_irq;
61
62 release_irq = platform_get_irq_byname(pdev, "pwrkey-release");
63 if (release_irq < 0)
64 return release_irq;
65
66 /* Make input device be device resource managed */
67 priv->input = devm_input_allocate_device(dev);
68 if (!priv->input)
69 return -ENOMEM;
70
71 priv->input->name = "rt5120_pwrkey";
72 priv->input->phys = "rt5120_pwrkey/input0";
73 priv->input->id.bustype = BUS_I2C;
74 input_set_capability(dev: priv->input, EV_KEY, KEY_POWER);
75
76 error = input_register_device(priv->input);
77 if (error) {
78 dev_err(dev, "Failed to register input device: %d\n", error);
79 return error;
80 }
81
82 error = devm_request_threaded_irq(dev, irq: press_irq,
83 NULL, thread_fn: rt5120_pwrkey_handler,
84 irqflags: 0, devname: "pwrkey-press", dev_id: priv);
85 if (error) {
86 dev_err(dev,
87 "Failed to register pwrkey press irq: %d\n", error);
88 return error;
89 }
90
91 error = devm_request_threaded_irq(dev, irq: release_irq,
92 NULL, thread_fn: rt5120_pwrkey_handler,
93 irqflags: 0, devname: "pwrkey-release", dev_id: priv);
94 if (error) {
95 dev_err(dev,
96 "Failed to register pwrkey release irq: %d\n", error);
97 return error;
98 }
99
100 return 0;
101}
102
103static const struct of_device_id r5120_pwrkey_match_table[] = {
104 { .compatible = "richtek,rt5120-pwrkey" },
105 {}
106};
107MODULE_DEVICE_TABLE(of, r5120_pwrkey_match_table);
108
109static struct platform_driver rt5120_pwrkey_driver = {
110 .driver = {
111 .name = "rt5120-pwrkey",
112 .of_match_table = r5120_pwrkey_match_table,
113 },
114 .probe = rt5120_pwrkey_probe,
115};
116module_platform_driver(rt5120_pwrkey_driver);
117
118MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
119MODULE_DESCRIPTION("Richtek RT5120 power key driver");
120MODULE_LICENSE("GPL");
121

source code of linux/drivers/input/misc/rt5120-pwrkey.c